For example, they called Jonathan Turley on the issue of what consitutes an impeachable offense. http://www.msnbc.com/rachel-maddow-show/impeachment-hearings-even-the-gops-witnesses-are-hurting-trump
It may seem like the GOP called no fact witnesses during the House impeachment hearings, since none of their (Tim Morrison & Kurt Volcker) testimony helped them, but they absolutely did call witnesses of their own:
In impeachment hearings, even the GOP's witnesses are hurting Trump
Yesterday was the first day in which the House impeachment inquiry featured public testimony from witnesses requested specifically by Republican members of the panel. As NBC News reported, these witnesses "were expected to provide testimony helpful to the president."
The report added, succinctly, "They did not."
...
Morrison went on to describe a conversation with Sondland, following the ambassador's conversation with Trump, who said Zelensky had to make a statement the White House wanted to hear as a condition for security assistance to be released.
...
Volker amended his testimony from his Oct. 3 closed-door deposition, telling the members of the committee Tuesday that he now sees that others in the Trump administration sought an investigation into the Biden family and that they told Ukraine's government that millions in military aid depended on it. [...
http://www.msnbc.com/rachel-maddow-show/impeachment-hearings-even-the-gops-witnesses-are-hurting-trump
Of course, none of this was reported on Fox News, so if that's the only place Ari Fleisher gets his news, he'd never know any of this.
I don't know why Google didn't help you. I got the above simply by Googling "Republican witnesses in House impeachment hearings" and lots of articles came up.